exam Maths Puzzle Numerical Ability

Please help me with the following

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2^-3a^-3/c(2a^3c - 8a^3/c^2)

thank u

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exam Other Question

if a foot ladder is six feet from a wall. How high on the wall does the ladder touch. Simplify the expression?

(square root of 3-5)(square root of 3 + 5)